package com.wenhao.unsafe;

import java.util.*;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * @author Wenhao Tong
 * @create 2021-08-19 21:35
 */
public class ListTest {
    public static void main(String[] args) {
//        List<String> list = Collections.synchronizedList(new ArrayList<>());
        // 写入时复制
        List<String> list = new CopyOnWriteArrayList<>();
        for (int i = 0;i < 10;i++) {
            new Thread(() -> {
                list.add(UUID.randomUUID().toString().substring(0,5));
                System.out.println(list);
            },String.valueOf(i)).start();
        }
    }
}
